Air valve for radiators



Feb. 7, 1928.

'L- STADELHOFER AIR VALVE FOR RADIAToRs.

Filed Oct. 8. 1926 0 Z H M INVENTOR ATTOR Y it) li "'7 a? 1i atentee 4, 1921s.

onirsn STATES PATENT OFFICE.

AIR VALVE FOR RADIATORS.

Application filed October 8, 1926.

This invention relates to an improved air valve for steam radiators which permits the escz pe of cold air but which closes to prevent the escape of steam when the valve becomes heated and prevents the entrance of cold air from the atmosphere when the valve cools.

The invention is designed to provide a valve of this kind which is positive in its operation and which has but few parts and in which a closure for the vent opening therein is held down by a thermostatic strip or its equivalent when the valve is heated.

The invention is illustrated in the accompanying drawings in which Figure l is a central vertical section ot a valve made according to my invention and Figure 2 is a section on line 22 in Figure 1. Figure 3 is a top view of the valve illustrated with a part tl ereot' broken away.

in the drawings, indicates the casing which has an air passage 11 therein and which also has an air inlet at the bottom, the air inlet being shown at 12 and arranged in threaded boss 13 by means of which is secured in a coil of the radn The horizontal partition 14 is ari V in the casing and has an opening 15 therein which opening has a suitable clo sure, preferably a ball 16 which is influenced by gravity to normally close the opening 17 the hall is of a weight to permit its being raised by pressure of the air attempting to escape from a rz'idiator that is becoming heated so that the heating ot the radiator is tac litated by reason of all such escape of cold air above the bal a thermostatic strip 17, thisstrip being or the usual kind that flexes or bends under increasing temperature, being norn'ially held out of contact with the hall 16 but when heated bulging or tlexin to hold the ball 16 down[ in the term shown the thermostatic strip 17 rests on a shoulder 18 and is secured by a cap 19 which lits on to the casing 10, the usual way being to screw the cap down so that it engages the thermostatic strip.

Serial No. 140,238.

Suitableair outlets 20 are placed in the cap it It will be evident that the ball will remain seated after the str'p cools and becomes straight when the pressure is from the outside, thus retaining any partial vacuum that is set up in the heating system when the pressure is reduced.

The construction enables the valve to be manufactured, cheaply as there are but few parts to be assembled and these are simple and require no tine adjustment in the assembhng.

I claim:

1. ii radiator air valve cou'iprising a casing with. an air inlet at the bottom and having a horizontal partition above the inlet, the partition having a central opening therein, a ball. resting by gravity in the opening, a cap insertible in the top of the casing and having an air outlet to one side of the centre and a thermostatic strip lying against the inside face of the cap and adapted, when heated, to be distorted enough to engage the ball and prevent its unseating, the ends of the strip being disposed between the cap and the casing.

2. A radiator air valve comprising a easing with an air inlet at the bottom and a horizontal partition with an opening therein, a ball in. the opening, a cap with an outlet opening and adapted to close the end of the casing, and a thermostatic strip normally held above the ball and adapted to hold the a hall down when heated, the strip being secured at its ends between the casing and the cap.

3. A radiator air valve comprising a casing with an air inlet at the bottom and a l'iorizontal partition with an opening therein, a ball in the opening, a cap with an outlet opening and a fiat thermostatic strip normally lying against the bottom of the cap and above the ball to engage the ball when heated. ii

In testimony whereof I a'liix my signature.

LESLIE STADELHOFER. 

